[Equest-users] Fully Variable Frequency System Modeling

YinRic cesseric at hotmail.com
Thu Jul 16 19:05:14 PDT 2009

Hi Cam,


Your warning helps. I aware the difficulty and will for sure advice the owner to invest more in good windows and frames. Thanks!


Best Regards,


From: cam at energyopportunities.com
To: cesseric at hotmail.com
Subject: RE: [SPAM] [Equest-users] Fully Variable Frequency System Modeling
Date: Thu, 16 Jul 2009 07:54:13 -0400

Afraid I can’t exactly help, but I do have a warning.  Appendix G (assuming you are LEED-NC v2.2 or later) requires that the baseline building be modeled with no more than 40% vertical fenestration.  It is likely you will need more sophisticated strategies (chilled beam, for instance) to achieve the minimum 14% (2 points) cost savings.  It would seem crucial that the project invest in good windows, especially the frames!  Good luck …

Cam S. Fitzgerald, PE, LEED AP
Energy Opportunities, LLC
a 7group company
phone:  (717) 292-2636 x11
fax:  (717) 292-0585
e-mail:  fitzgerald at sevengroup.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of YinRic
Sent: Wednesday, July 15, 2009 10:47 PM
To: equest-users at lists.onebuilding.org
Subject: [SPAM] [Equest-users] Fully Variable Frequency System Modeling
Could anyone kindly help me to make some sense about how to model fully variable frequency air-conditioning system? In this system, most of the components on the water side are fully variable, including chiller, pump and cooling tower. These components work together to make the system operate under "optimized" condition. This is gonna be a LEED project...The envelope is poor, full glass curtain. Lighting system does not have better energy performance compared with the Baseline either. Some "advanced techniques" must be figured out on HVAC side...
Any comments are appreciated. 
Best Regards,

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